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Calibration of a gradient‐enhanced damage model for viscoplastic shell structures subjected to shock‐wave loadings
Author(s) -
Nguyen An Danh,
Stoffel Marcus
Publication year - 2017
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201710100
Subject(s) - viscoplasticity , materials science , anisotropy , mechanics , shock (circulatory) , calibration , ultimate tensile strength , shell (structure) , displacement (psychology) , structural engineering , composite material , finite element method , physics , constitutive equation , engineering , optics , medicine , psychology , quantum mechanics , psychotherapist
In this study, we proposed both a numerical and experimental methodology for material parameter identification to validate the gradient‐damage model in [1]. A nonlocal anisotropic damage model for viscoplastic thin‐walled shells was proposed by introducing a gradient‐enhanced free energy function. For the experimental methodology, cyclic micro‐bending and ‐tensile tests were conducted to identify the damage size effects to calibrate the proposed FE model. Numerical results were obtained and compared with displacement‐force curves from shock‐tube tests. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)